Improvement in the manufacture of glue



UNITED STATES PATENT OFFICE.

HUGH MCDOUGALL AND COLL. MGDOUGALL, OF CHICAGO, ILLINOIS.

IMPROVEMENT [N THE MANUFACTURE OF GLUE.

Specification forming part of Letters Patent No. 130,230, dated August 6, 1872.

SPECIFICATION.

. steam.

Heretofore the water of condensation in steam-rendered lard has been drawn ofi' and thrown away as worthless, but we have found, by use, that such water contains from fifteen to twenty per cent. of glue in solution, the difference consisting, mainly, by reason of the difference of pressure in rendering the lard. The steam dissolves the gelatinousmatter in the cuticles which surround the globules of oil, or forms the sacks which contain them, and in the pieces of skin and other matters contained in or mixed with the lard or other fatty matter to be rendered. After separating the water from the lard by drawing it 011' or by drawing the lard off, the water is evaporated by any suitable apparatus, and the gluestock dried in any of the processes or devices used for that purpose.

What we claim as new, and desire to secure by Letters Patent, is

The utilizing of the water of condensation in stean1-rendered lard and other fatty matters by reducing it to glue-stock, substantially as specified.

HUGH MCDOUGALL. COLL. MODOUGALL. Witnesses:

L. L. BOND, O. W. BOND. 

